Is your state one of the 38 states that requires an arrest at a domestic violence scene? Do you know the best law enforcement protocol to raise the percentage of convictions and jail time of the domestic violence perpetrator? Approaching domestic violence from a law enforcement angle, Eric L. Nelson, Ph.D., M.S., M.A., Forensic & Best Practices Criminologist, shares six actions every police officer should take each time he or she investigates a domestic violence crime. Nelson says they triple rates of prosecution and double rates of criminal conviction.